<div class="refentry" lang="en" xml:lang="en"><a id="gluQuadricCallback"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>gluQuadricCallback — define a callback for a quadrics object</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table><tr><td><code class="funcdef">void <b class="fsfunc">gluQuadricCallback</b>(</code></td><td>GLUquadric*  </td><td><var class="pdparam">quad</var>, </td></tr><tr><td> </td><td>GLenum  </td><td><var class="pdparam">which</var>, </td></tr><tr><td> </td><td>_GLUfuncptr  </td><td><var class="pdparam">CallBackFunc</var><code>)</code>;</td></tr></table></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>quad</code></em></span></dt><dd><p>
                    Specifies the quadrics object (created with <a class="citerefentry" href="gluNewQuadric"><span class="citerefentry"><span class="refentrytitle">gluNewQuadric</span></span></a>).
                </p></dd><dt><span class="term"><em class="parameter"><code>which</code></em></span></dt><dd><p>
                    Specifies the callback being defined.
                    The only valid value is <code class="constant">GLU_ERROR</code>.
                </p></dd><dt><span class="term"><em class="parameter"><code>CallBackFunc</code></em></span></dt><dd><p>
                    Specifies the function to be called.
                </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p>
            <code class="function">gluQuadricCallback</code> is used to define a new callback to be used by a quadrics object.
            If the specified callback is already defined, then it is replaced. If
            <em class="parameter"><code>CallBackFunc</code></em> is NULL, then any existing callback is erased.
        </p><p>
            The one legal callback is <code class="constant">GLU_ERROR</code>:
        </p><div class="variablelist"><dl><dt><span class="term"><code class="constant">GLU_ERROR</code></span></dt><dd><p>
                        The function is called when an error is encountered. Its single argument
                        is of type GLenum, and it indicates the specific error that occurred.
                        Character strings describing these errors can be retrieved with the
                        <a class="citerefentry" href="gluErrorString"><span class="citerefentry"><span class="refentrytitle">gluErrorString</span></span></a> call.
                    </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p>
            <a class="citerefentry" href="gluErrorString"><span class="citerefentry"><span class="refentrytitle">gluErrorString</span></span></a>,
            <a class="citerefentry" href="gluNewQuadric"><span class="citerefentry"><span class="refentrytitle">gluNewQuadric</span></span></a>
        </p></div><div class="refsect1" lang="en" xml:lang="en"><div id="Copyright"><h2>Copyright</h2><p>
            Copyright © 1991-2006
            Silicon Graphics, Inc. This document is licensed under the SGI
            Free Software B License. For details, see
            <a class="ulink" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>.
        </p></div></div></div>
